You can watch their fortunes grow. In 2024, Oxfam’s figures show, the wealth of the world’s 2,769 billionaires grew by $2tn, or $2,000bn. The total global spending on international aid last year was projected to be, at most, $186bn, less than a tenth of the increment in their wealth. Governments tell us they “can’t afford” more. In the UK, billionaires, on average, have become more than 1,000% richer since 1990. Most of their wealth derives from property, inheritance and finance. They have become so rich, in other words, at our expense.